I do not have a MySQL install available right now to test, but I would take it that, in an update query, most (if not all) relational DB engines will report the number of raws matched by the where clauses, whether or not the new values are equal or not to the old ones. In effect, AFAICT, for the DB engine, the raws are being updated even if the new values happen per chance to be the same as the old ones. I would therefore think that the only way to know the number of raws where some value actually changed is to add where clauses as suggested by tye.

Or am I wrong on that?

In reply to Re^4: [Solved]: How to get count of rows changed by MySQL UPDATE command using DBI by Laurent_R
in thread [Solved]: How to get count of rows changed by MySQL UPDATE command using DBI by Perl300

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